When we say responsible for the dogs forever - we do really mean forever. I have animals returned to me when they were 9 years old because of significant family issues or death of the owner - I currently have a 12 year old and a 7 year old that now live with me.
Think about what that means - because even those of us who are prepared for that - really are never prepared for the impact on our families houses and other dogs.
You say you want to keep 2 - be advised that the everyone hanging out together in basenji world is NOT the norm. Most can have 1 male and 1 female - if you are planning on keeping 2 - you may have a problem - not right away but eventually you are likely to do so. I am not sure that I remember who or where Chaos came from but fanconi testing and eye testing for PRA would be critical as well as thyroid screening. What titles does she have - is she a fast as the wind Field CH or Obedience or rally or conformation CH. That would allow you to have evidence that she has characteristics that are valuable to the breed as a whole and quite frankly if all you want are a couple more basenjis - there are many many out there that could use a forever home.
In any event - think about it - it's not as easy as you think - if you are going to do it right - and finding good homes is also not as easy as you think. You may not have the experience in weeding out puppy mills who might want your pups and living where you do - you are in the midst of some that do produce basenjis.